dangilroy
New Member
- Joined
- Jul 28, 2008
- Messages
- 3
- Vehicle Year
- 1993
- Transmission
- Manual
I've got a problem with my 93 Ranger 3.0L V6. I think it's a fuel injection problem.
The truck starts and runs normally for a couple minutes, or about a mile. Then it loses power and will barely idle, and has little or no throttle response above idle. It first it did this erratically, and returned to normal, but for the last few weeks, it's doing it all the time
I changed the fuel filter, and the fuel pressure is normal.
It seems like it loses power around the time it should be switching from open loop to closed loop.
I can take the electrical connector to the MAF off and it runs ok. It might be a little rough, but it has good power. That's how I've been running it the last few weeks. I'm guessing that disabling the MAF, puts the system into open loop and gives me a rich mixture, but I have no way of really knowing.
With the MAF disconnected I get codes 158, 157, 159, which mean MAF out of range, or voltage too low, or too high.
With the MAF connected and the engine idling rough, I get codes 136 and 172 = #1 and #2 banks running lean. But no codes pointing to specific hardware.
Are there any fuel injection gurus out there who can help me make sense of this? I'd rather not just start changing parts at random.
The truck starts and runs normally for a couple minutes, or about a mile. Then it loses power and will barely idle, and has little or no throttle response above idle. It first it did this erratically, and returned to normal, but for the last few weeks, it's doing it all the time
I changed the fuel filter, and the fuel pressure is normal.
It seems like it loses power around the time it should be switching from open loop to closed loop.
I can take the electrical connector to the MAF off and it runs ok. It might be a little rough, but it has good power. That's how I've been running it the last few weeks. I'm guessing that disabling the MAF, puts the system into open loop and gives me a rich mixture, but I have no way of really knowing.
With the MAF disconnected I get codes 158, 157, 159, which mean MAF out of range, or voltage too low, or too high.
With the MAF connected and the engine idling rough, I get codes 136 and 172 = #1 and #2 banks running lean. But no codes pointing to specific hardware.
Are there any fuel injection gurus out there who can help me make sense of this? I'd rather not just start changing parts at random.